alamb commented on a change in pull request #488:
URL: https://github.com/apache/arrow-rs/pull/488#discussion_r656979521



##########
File path: arrow/Cargo.toml
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@@ -60,6 +63,8 @@ csv = ["csv_crate"]
 ipc = ["flatbuffers"]
 simd = ["packed_simd"]
 prettyprint = ["prettytable-rs"]
+# enable features that rely on std
+std = ["rand/std", "rand/std_rng"]

Review comment:
       I am not sure about this one -- I needed to conditionally pull in the 
`rand` crate features that rely on `std` as it is needed for the 
`arrow-pyarrow-integration-testing` -- something about how `maturin` builds 
arrow requires the std features of rand (seems to build the tests as well)
   
   However, if we use the default features of rand then we can't build for wasm 
anymore 🤔 
   
   @jorgecarleitao  I am not sure if you have any thoughts




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